Automatically threading loom shuttle



July 9, 1929. v 1,720,411 I AUTOMATICALLY THREADING LOOM SHUTTLE Fiied Sept. 28, 1928 n '1 I. n lllllllm lNVE/VTORf BY if" M ATTORNEY Patented July 9, 1929.

1 lflilth lll PATENT QFFlCE.

HARRY A. DAVIS, 6F EEEOPEDAIIE, MASEBACHUSETTS, ASSIG NOR TO DBAPER CORPOEhdL' TION, 1F HOPEDALE, IVEASSACHUSJETTS, A CORPORATION OF MAINE.

AUTOMATICALLY THREADING LOOM SHUTTLE.

Application filed September 28, 1928.

This invention relates to automatically thread ing loom shuttles wherein the shuttle threaded during the loom operation, and is more particularly directed to thread tension- 5 ingmeans and thread lead for such shuttles to insure maintenance of proper tension upon the thread during weaving.

During normal weaving operations it is desirable to maintain a substantially constant 10 tension upon the thread as it is delivered from the shuttle, in order that perfect cloth may be woven, and many attempts have heretofore been made to secure this desired result.

lVhen the shuttle is completely threaded, the thread leads forwardly of the shuttle through a longitudinally extending thread passage and is delivered through the side delivery eye. Inasmuch as the shuttle is sub jeeted to sudden shocks as its reaches the end. of its pick, the thread is liable to be overthrown or loop frontwardly of the shuttle, and sometimes it will come out of the side delivery eye. Should the shuttle be picked from the non-repienishing side of the loom under the conditions above stated and the thread lead directly from the end of the filling; carrier or bobbin backwardly to the cloth selvage, it will be broken.

One of the important features of the presout invention consists of a: automatically threading shuttle provided with double ten-- sharing devices, one of which is mounted in the longitudinal thread passage adjacent the bobbin chamber, and hereinafter referred to as the rear tension device, and the other of which is mounted at the forward portion of the longitiuilinal passage, and hereinafter referred to as the front tension device, and (hiring the normal weaving operation with the shuttle fully threaded, the thread is caused to pass through and under the control of both tensioning devices, thereby insuring a constant and uniform tension upon the thread during weaving. Associated with each of the tensioning devices is a thread guide, the guiding surface of which relative to both tensioninp; devices is below the top thereof, so that the thread is held in control of both tensioning devices during weaving.

Another important feature of the present invention consists of means disposed between the two tensicning devices to engage the thread when the shuttle becomes partially unthreaded and provide a lead for the thread under these conditions which will prevent ELI! Serial No. 309,053.

breakage and yet insure substiuitially the same constant tension upon the thread.

The invention and new combination of parts will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings:

Fig. 1 is a plan view of an automatically threadin shuttle, showing more particularly the thread delivery end of the shuttle, and provided with the present invention;

Fig. 2 is adetached perspective detail of a threading block containing the present invention and showing the lead of the thread when the shuttle has become partially unthreaded Fig. 8 is an enlarged section on the line of Fig. 1; and

Fig. d is a section through the threading block on the line l- 1 of Fig. 1, showing more particularly the rear tensioning device and the cover reaching partially over the top of said device.

The shuttle 1 is provided with the usual bobbin chamber 2 in which mounted the fillin carrier or bobbin 3 having the filling a wound thereon, and frontward of the bobbin chamber the shuttle is provided with an open longitudinal thread passage leading to the side delivery eye 4:. In the ')resent in stance of the inventirm, the longitudinal thread passage 5 is formed in a thrczulingr block (5 which may be appropriately secured in the usual. threading block chamber of the shuttle by means of a bolt 7 which passes through an opening 8 in the threading block.

Mounted in the longitudinal thread passage is the rear thread tensioning device which, as shown in the present instance, is of the spring clamp type. The rear tension ing device consists of two plates 9 and 10, Fig. 4-, between which the thread passes as it is delivered from the shuttle and each of the tensioning members 9 and 10 may be appropriately subjected to the clamping action of the springs 11 and 12 whereby the two clamping members are held in closed or clamping position. One of the springs, as 12, in the present instance. may be adjusted to exert more or less tension upon its associated clamping member 10 by means of an adjusting screw 13, one end of which bears against the spring; 12, and the other end of which extends to the exterior of the shuttle, whereby it may be adjusted to exert the tie sired tensioning effect upon the associated clamping member 10. The upper end of each of the clamping members Sand lOisflared outward, as indicated at 14 and 15, Fig. 1-, and the outer portions thereof extend into openings 16 and 17 formed in the walls of the threading block 6. The two clamping members 9 and 10, as shown, are mounted upon a cross-pin 18 extending transversely of the threading block, which afforos a support for the clamping members in their position adjacent he entrance to the longitudinal thread passage and bobbin chamber. o

At'the forward or front end of the longitudinal thread passage is the front spring tension device which is preferably positioned as the bridge delivering end of the thread passage. The front spring clamp tensioniug device may be variously contrived, but is herein shown as comprising a fixed cylindrical member 19 and a spring-actuated clampin member 20, both of which may be mounted upon a suitable support, as. for instance, the threaded bolt 21, Fig. The fixed clamping member 19 is preferably nounted in suitable recess 22 formed in the front wall 23 of the threading block, while the spring-actuated clamping member is oppositely disposed upon the threaded bolt 21 and is provided with a recess in which may be seated a spring 25 bearing against the head 26 of the threaded bolt and exerting an inward stress or compressive action against the tensioning member 20.

As indicated more clearly in Figs. 1 and the contacting surfaces of the two clanminu members 19 and 20 are so disposed that thread passing between the clamping members may be deflected to one side of the thread passage towards the side delivery eye.

From the construction thus far described it vill be apparent that the present invention provides two spring-clamped tensioning members, one adjacent the entrance to the longitudinal thread passage, and the other adjacent the forward or front end portion ot the thread passage, and during the. weaving operation the thread passes through and is under .controlof both of the tensioning de vices, which may be adjusted to exert the desired tension upon the thread.

Associated with each of the two tensioning is a thread guide whose thread-ensuri'ace is below the top portions of tcnsioning devices.

bread guide adjacent the rear spring; tensioning device is formed by a laterally and downwardly extending projection or too 27, as more clearly indicated in Fig. 2, and the guiding surface 28 which is curved upwardly at the inner portion of the projection 27, is

7 below the top of the rear tensioning device composed of the tensioning members 9 and 10, with the result that during weaving operat-uu'ls the thread being unwound. from the filling! carrier or bobbin will be held suf iiciently low relative to the rear spring tensioning device to insure its proper engagement between the two tcusion ug members thereof.

The thread guide for the front lensioniug member, shown more clearly in l ig. l, is formed on or is part of the threading block frontward and at the side of the front tensioning device, and consists of a guide iucinher 29 the guiding surface of which is below the top of the front tensioning device and under which the thread passes on its way to the side delivery eye Duringnormal weaving operations when the shuttle is fully threaded it will be apparent that the double tension, one member of which is adjacent the entrance to the longitudinal thread passage and the othcr ol which is adjacent the exit of the thraid passage. will both engage the thread and subcct It to the uniform action as dcscrilwd, by

tie 517F111? action of the spring clamping members of the tension devices Extending downwardly well into the lougitudii'ial thread passage 5 from the bacl; wall 30 of the longitudinal passage between the rear and front s t-ring; tension devices is a hool; 31. the lower end portion 3:) of wh ch reaches frontward to ar la the front spring tension device. and should the thread (a be thrown from "he side delivery eye during the veaving operation, it will be :aught by the hook 31 and given a lead to prevent thread breakage as the shuttle is picked.

At this time it is desirable that the thread lea L be such as to insure that the thread delivercd from the thread carrier or bobbin 3 be niai ained in control of the rear tensioning device, and to this end the ltitl portion 83 of the hook 31 about which the thread paases under the conditions above noted, is lo ed w ll down in the longitudinal thread passage below the top of the rear tcnsiouing device, thereby insuring in connection with the thread lea l at the entrance to the lougitudiual passac c th: t the thread will be given tension by the rear tensioning device.

Extending from the top portion of the front wall 23 of the thread pas ice is a cover Set which readies laterally over the top of the rear tcnsioning device, as ind cated more clearly in Fi 1. 2 and l. The cover St has the forwardly extending rounded edge 35 and adjacent the entrance to the longitudinal thread passage it is curved outwardly again,

t St, to form a recess 37 between the proction i1? and the top of the cover. the relt boil hen the shuttle is partially threaded; 1 it is. the th ead has been thrown out of the side delivery eye and leads baclo wardly about the lead portion 533 of the book 31, the portion of the thread a lcinliuefrom the lillii ,7 z rrier bobbin will pass through the rear spring tension-clamp about the ead Ill) lill) of the hook 31 and then backwardly towards the cloth SQlVELSIQ, as indicated at a, Fig. 2, and engage under the cover 64, the downturned edge of which. at 35 will engage the backward extending portion a of the thread a to impart to the thread an additional friction or tension, thus compensating for the lost frictional tension prevously exerted by the front spring tensioning device.

From the construction thus far described it will be apparent that during normal weaving OIJQI'ai lOIIS when the shuttle .is fully threaded, the double tension devices, one at the rear and the other at the front of the thread passage, will act upon the thread toor friction upon the thread as it had curing normal weaving operations.

hat is claimed is:

1. An automatically threading loom shutt le having a bobbin chamber, a longitudinal thread passage having on open top through which the thread automatically passes on the first pick of the shuttle following replenishment and side delivery a rear spring clamp tension device mounted in the longitudinal thread passage adjacent the bobbin chamber, and a brid e formed as a front spring clamp tension devicemounted in the longitudinal thread passage at the forward or exit end thereof andthroum which the thread passes downwardly to the side delivery eye when the shuttlis completely threaded that the (.louble spring tensions may act upon the thread and insure tension thereon during weaving.

2. An auton'iatically tl'n'eading loom shuttle having a bobbin chamber, a longitudinal thread passage into which the thread passes automatically on the first pick of the shuttle following replenishment and side delivery eye, a rear spring clamp tension device mounted at the entrance to the longitudinal thread assage adjacent the bobbin chamber,

and a bridge constituted as a front spring clamp tension device mounted in the longitudinal thread passage atthe forward ore-Kit end thereof, a thread guide below the front spring clamp tension device adjacent the exit end of the longitudinal thread pa sage to deflect the thread downwardly through and into control of the tension device during weaving.

3. An automatically tlireadingloom shuttle having a bobbin chamber, a longitudinal thread passage and side delivery eye. a rear spring clamp tension device mounted in the longitudinal thread passage at the entrance thereto adjacent the bobbin chamber, a thread guide extending transversely oi the longitudinal tl'iread passage lmtween the rear spruig clamp tension d.

ice and the bobbin chamber to depress the thread into control of the said tension device, and a bridge constituted. as a front synring clamp tension device mounted in the longitudinal thread passage at the forward or exit end thereof adjacent the side delivery eye that the double spring tensions may act upon the thread and insure tension thereon during weaving.

4;. An automatically threading loom shut-- tle having a bobbin clmrnber, a longitudinal thread 1' issage and side delivery eye, a rear spring clamp tension. device between the ineinl'iers of which the thread passes atthe entrance to the longitudinal thread pt sage, a thread guide transversely of the entrance to the thread passage havin its thread guiding portion below the top of the rear s )ring elau'ip tension device to maintain the t iread in control e aid tension device during weaving, and a front spring clamp tension device at the exit end of the longitudinal thread passage that the double spring tensions may act upon the thread during weaving and insure proper tension.

An automatically threading loom shut tle l' aving a bobbin chamber, a longitudinal thread passage and side delivery eye, a rear spring clamp tension device between the members of which the thread passes 2t the entrance to the longitudinal thread passage, a thread guide transversely of the entrance to the thread passage having its thread guiding portion below the top of the spring elan'ip tension device to maintain the thread in con trol of said tension device during weaving, anda front spring clamp tension device at the exit end of the longitudinal thread passage, and a thread guide below the second spring clamp tension device to maintain the thread in control of said front tension device and direct it to the side delivery eye that the double spring tensions may act upon the thread during; weaving and insure proper tension.

6. An automatically threading loom shuttle having a side delivery eye and a threading block provided with a longitudinal thread passage, arear spring clamp tension device between the members of which the thread passes adjacent the entrance to the longitudinal thread passage, a front spring clamp tension device adjacent the exit end of the longitudinally thread passage forn'iing the bridge, and thread guides having their thread guiding portions below the thread clamping portion of the adjacent spring clamp tension device to maintain the thread in control of said tension. devices as the thread is delivered from the shuttle during weaving.

I. An automatmally threading loom shuttle having a bobbin chamber, a longitudinal thread passage and side delivery eye a rear spring clamptension device mounted in the longitudinal thread passage adjacent the bobbin chamber, and between the members of which the thread passes,.and a bridge at the front terminal portion of the thread passage constituted as a spring clamp tension device comprising two members having their abutting faces between Vwhich the thread passes at the side of the thread passage adjacent the side delivery eye that the thread may be subjected to tension by each of the spring tension devices during weaving.

8. An automatically threading loom shuttle having a bobbin chamber, a longitunal thread passage and side delivery eye, a rear spring clamp tension device mounted in the longitudinal thread passage adjacent the bobbin chamber, and between the members of which the thread passes and a front spring clamp tension device forming the bridge in the longitudinal thread passage at the forward end thereof and comprising two members having their tensioning "faces at the side of the thread passage adjacent the side delivery eye that the double spring tensions may act upon the thread and insure tension there on during weaving, and a thread engaging I y hook reaching torward trom the back wall OL the thread passage between the two tension devices to guide the thread in case it fails to pass through the front tension device and side delivery eye as the shuttle is picked.

9. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and side delivery eye, a rear spring clamp tension device mounted in the longitudinal thread passage adjacent the bobbin chamber, and a front spring clamp tension device mounted in the longitudinal thread passage at the forward or exit end thereof and constituting the bridge adjacent the side delivery eye that the double spring tensions may act upon the thread and insure tension thereon during weaving, a thread engaging hook in the longitudinal passage between the two tension devices to guide the thread in case it fails to be delivered through the front tension device and side delivery eye, and a cover reaching across part of the rear tension device to engage above the thread when it is guided by the hook between the two tension devices as the shuttle is picked.

10. An auton'iati ally threading loom shuttle having a bobbin chamber, a longitudinal thread passage and side delivery eye, a rear spring clamp tension device mounted in the longitudinal thread passage adjacent the bobbin chamber, and a tront spring clamp tension device mounted in the longitudinal thread passage at the forward or exit end thereof adjacent the side delivery eye that the double spring tensions may act upon the thread and insure tension thereon during weaving, a thread engaging hook in the longitudinal. passage between the two tension dcvices to guide the thread in case it fails to be delivered through the front tension device and side delivery ye, and a cover reaching from the front wall of the thread passage across part of the rear tension device and under which the thread passes when it is guided by the hook between the two tension devices as the shuttle is picked.

11. An automatically threading shuttle having a side delivery eye and threading block provided with a longitudinal thread passage, a rear i-ipring tension device and a front spring tension device constituting a double tension for the tl cad during normal weaving operations, a cover reaching from the front wall of the thread passage part way across and above the rear spring tension dcvice, a hook reaching trentward in the thread passage between the tension devices and having its thread guiding portion lower than the cover that the thread may be guided below the cover should it fail to be delivered through the front spring tension device and side delivery eye when the shuttle is picked.

In testimony whereof, I have signed my name to this specification.

' HARRY A. DAVIS. 

